diff --git a/third_party/go/opencensus-proto/gen-go/metrics/v1/BUILD.bazel b/third_party/go/opencensus-proto/gen-go/metrics/v1/BUILD.bazel
new file mode 100644
index 0000000..b130dcf
--- /dev/null
+++ b/third_party/go/opencensus-proto/gen-go/metrics/v1/BUILD.bazel
@@ -0,0 +1,14 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["metrics.pb.go"],
+    importpath = "github.com/census-instrumentation/opencensus-proto/gen-go/metrics/v1",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_github_census_instrumentation_opencensus_proto//gen-go/resource/v1:go_default_library",
+        "@com_github_golang_protobuf//proto:go_default_library",
+        "@io_bazel_rules_go//proto/wkt:timestamp_go_proto",
+        "@io_bazel_rules_go//proto/wkt:wrappers_go_proto",
+    ],
+)
diff --git a/third_party/go/opencensus-proto/gen-go/metrics/v1/metrics.pb.go b/third_party/go/opencensus-proto/gen-go/metrics/v1/metrics.pb.go
new file mode 100644
index 0000000..466b234
--- /dev/null
+++ b/third_party/go/opencensus-proto/gen-go/metrics/v1/metrics.pb.go
@@ -0,0 +1,1127 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: opencensus/proto/metrics/v1/metrics.proto
+
+package v1
+
+import (
+	fmt "fmt"
+	v1 "github.com/census-instrumentation/opencensus-proto/gen-go/resource/v1"
+	proto "github.com/golang/protobuf/proto"
+	timestamp "github.com/golang/protobuf/ptypes/timestamp"
+	wrappers "github.com/golang/protobuf/ptypes/wrappers"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// The kind of metric. It describes how the data is reported.
+//
+// A gauge is an instantaneous measurement of a value.
+//
+// A cumulative measurement is a value accumulated over a time interval. In
+// a time series, cumulative measurements should have the same start time,
+// increasing values and increasing end times, until an event resets the
+// cumulative value to zero and sets a new start time for the following
+// points.
+type MetricDescriptor_Type int32
+
+const (
+	// Do not use this default value.
+	MetricDescriptor_UNSPECIFIED MetricDescriptor_Type = 0
+	// Integer gauge. The value can go both up and down.
+	MetricDescriptor_GAUGE_INT64 MetricDescriptor_Type = 1
+	// Floating point gauge. The value can go both up and down.
+	MetricDescriptor_GAUGE_DOUBLE MetricDescriptor_Type = 2
+	// Distribution gauge measurement. The count and sum can go both up and
+	// down. Recorded values are always >= 0.
+	// Used in scenarios like a snapshot of time the current items in a queue
+	// have spent there.
+	MetricDescriptor_GAUGE_DISTRIBUTION MetricDescriptor_Type = 3
+	// Integer cumulative measurement. The value cannot decrease, if resets
+	// then the start_time should also be reset.
+	MetricDescriptor_CUMULATIVE_INT64 MetricDescriptor_Type = 4
+	// Floating point cumulative measurement. The value cannot decrease, if
+	// resets then the start_time should also be reset. Recorded values are
+	// always >= 0.
+	MetricDescriptor_CUMULATIVE_DOUBLE MetricDescriptor_Type = 5
+	// Distribution cumulative measurement. The count and sum cannot decrease,
+	// if resets then the start_time should also be reset.
+	MetricDescriptor_CUMULATIVE_DISTRIBUTION MetricDescriptor_Type = 6
+	// Some frameworks implemented Histograms as a summary of observations
+	// (usually things like request durations and response sizes). While it
+	// also provides a total count of observations and a sum of all observed
+	// values, it calculates configurable percentiles over a sliding time
+	// window. This is not recommended, since it cannot be aggregated.
+	MetricDescriptor_SUMMARY MetricDescriptor_Type = 7
+)
+
+var MetricDescriptor_Type_name = map[int32]string{
+	0: "UNSPECIFIED",
+	1: "GAUGE_INT64",
+	2: "GAUGE_DOUBLE",
+	3: "GAUGE_DISTRIBUTION",
+	4: "CUMULATIVE_INT64",
+	5: "CUMULATIVE_DOUBLE",
+	6: "CUMULATIVE_DISTRIBUTION",
+	7: "SUMMARY",
+}
+
+var MetricDescriptor_Type_value = map[string]int32{
+	"UNSPECIFIED":             0,
+	"GAUGE_INT64":             1,
+	"GAUGE_DOUBLE":            2,
+	"GAUGE_DISTRIBUTION":      3,
+	"CUMULATIVE_INT64":        4,
+	"CUMULATIVE_DOUBLE":       5,
+	"CUMULATIVE_DISTRIBUTION": 6,
+	"SUMMARY":                 7,
+}
+
+func (x MetricDescriptor_Type) String() string {
+	return proto.EnumName(MetricDescriptor_Type_name, int32(x))
+}
+
+func (MetricDescriptor_Type) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{1, 0}
+}
+
+// Defines a Metric which has one or more timeseries.
+type Metric struct {
+	// The descriptor of the Metric.
+	// TODO(issue #152): consider only sending the name of descriptor for
+	// optimization.
+	MetricDescriptor *MetricDescriptor `protobuf:"bytes,1,opt,name=metric_descriptor,json=metricDescriptor,proto3" json:"metric_descriptor,omitempty"`
+	// One or more timeseries for a single metric, where each timeseries has
+	// one or more points.
+	Timeseries []*TimeSeries `protobuf:"bytes,2,rep,name=timeseries,proto3" json:"timeseries,omitempty"`
+	// The resource for the metric. If unset, it may be set to a default value
+	// provided for a sequence of messages in an RPC stream.
+	Resource             *v1.Resource `protobuf:"bytes,3,opt,name=resource,proto3" json:"resource,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
+	XXX_unrecognized     []byte       `json:"-"`
+	XXX_sizecache        int32        `json:"-"`
+}
+
+func (m *Metric) Reset()         { *m = Metric{} }
+func (m *Metric) String() string { return proto.CompactTextString(m) }
+func (*Metric) ProtoMessage()    {}
+func (*Metric) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{0}
+}
+
+func (m *Metric) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Metric.Unmarshal(m, b)
+}
+func (m *Metric) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Metric.Marshal(b, m, deterministic)
+}
+func (m *Metric) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Metric.Merge(m, src)
+}
+func (m *Metric) XXX_Size() int {
+	return xxx_messageInfo_Metric.Size(m)
+}
+func (m *Metric) XXX_DiscardUnknown() {
+	xxx_messageInfo_Metric.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Metric proto.InternalMessageInfo
+
+func (m *Metric) GetMetricDescriptor() *MetricDescriptor {
+	if m != nil {
+		return m.MetricDescriptor
+	}
+	return nil
+}
+
+func (m *Metric) GetTimeseries() []*TimeSeries {
+	if m != nil {
+		return m.Timeseries
+	}
+	return nil
+}
+
+func (m *Metric) GetResource() *v1.Resource {
+	if m != nil {
+		return m.Resource
+	}
+	return nil
+}
+
+// Defines a metric type and its schema.
+type MetricDescriptor struct {
+	// The metric type, including its DNS name prefix. It must be unique.
+	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	// A detailed description of the metric, which can be used in documentation.
+	Description string `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	// The unit in which the metric value is reported. Follows the format
+	// described by http://unitsofmeasure.org/ucum.html.
+	Unit string                `protobuf:"bytes,3,opt,name=unit,proto3" json:"unit,omitempty"`
+	Type MetricDescriptor_Type `protobuf:"varint,4,opt,name=type,proto3,enum=opencensus.proto.metrics.v1.MetricDescriptor_Type" json:"type,omitempty"`
+	// The label keys associated with the metric descriptor.
+	LabelKeys            []*LabelKey `protobuf:"bytes,5,rep,name=label_keys,json=labelKeys,proto3" json:"label_keys,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
+	XXX_unrecognized     []byte      `json:"-"`
+	XXX_sizecache        int32       `json:"-"`
+}
+
+func (m *MetricDescriptor) Reset()         { *m = MetricDescriptor{} }
+func (m *MetricDescriptor) String() string { return proto.CompactTextString(m) }
+func (*MetricDescriptor) ProtoMessage()    {}
+func (*MetricDescriptor) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{1}
+}
+
+func (m *MetricDescriptor) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_MetricDescriptor.Unmarshal(m, b)
+}
+func (m *MetricDescriptor) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_MetricDescriptor.Marshal(b, m, deterministic)
+}
+func (m *MetricDescriptor) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_MetricDescriptor.Merge(m, src)
+}
+func (m *MetricDescriptor) XXX_Size() int {
+	return xxx_messageInfo_MetricDescriptor.Size(m)
+}
+func (m *MetricDescriptor) XXX_DiscardUnknown() {
+	xxx_messageInfo_MetricDescriptor.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_MetricDescriptor proto.InternalMessageInfo
+
+func (m *MetricDescriptor) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *MetricDescriptor) GetDescription() string {
+	if m != nil {
+		return m.Description
+	}
+	return ""
+}
+
+func (m *MetricDescriptor) GetUnit() string {
+	if m != nil {
+		return m.Unit
+	}
+	return ""
+}
+
+func (m *MetricDescriptor) GetType() MetricDescriptor_Type {
+	if m != nil {
+		return m.Type
+	}
+	return MetricDescriptor_UNSPECIFIED
+}
+
+func (m *MetricDescriptor) GetLabelKeys() []*LabelKey {
+	if m != nil {
+		return m.LabelKeys
+	}
+	return nil
+}
+
+// Defines a label key associated with a metric descriptor.
+type LabelKey struct {
+	// The key for the label.
+	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	// A human-readable description of what this label key represents.
+	Description          string   `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *LabelKey) Reset()         { *m = LabelKey{} }
+func (m *LabelKey) String() string { return proto.CompactTextString(m) }
+func (*LabelKey) ProtoMessage()    {}
+func (*LabelKey) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{2}
+}
+
+func (m *LabelKey) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_LabelKey.Unmarshal(m, b)
+}
+func (m *LabelKey) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_LabelKey.Marshal(b, m, deterministic)
+}
+func (m *LabelKey) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_LabelKey.Merge(m, src)
+}
+func (m *LabelKey) XXX_Size() int {
+	return xxx_messageInfo_LabelKey.Size(m)
+}
+func (m *LabelKey) XXX_DiscardUnknown() {
+	xxx_messageInfo_LabelKey.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_LabelKey proto.InternalMessageInfo
+
+func (m *LabelKey) GetKey() string {
+	if m != nil {
+		return m.Key
+	}
+	return ""
+}
+
+func (m *LabelKey) GetDescription() string {
+	if m != nil {
+		return m.Description
+	}
+	return ""
+}
+
+// A collection of data points that describes the time-varying values
+// of a metric.
+type TimeSeries struct {
+	// Must be present for cumulative metrics. The time when the cumulative value
+	// was reset to zero. Exclusive. The cumulative value is over the time interval
+	// (start_timestamp, timestamp]. If not specified, the backend can use the
+	// previous recorded value.
+	StartTimestamp *timestamp.Timestamp `protobuf:"bytes,1,opt,name=start_timestamp,json=startTimestamp,proto3" json:"start_timestamp,omitempty"`
+	// The set of label values that uniquely identify this timeseries. Applies to
+	// all points. The order of label values must match that of label keys in the
+	// metric descriptor.
+	LabelValues []*LabelValue `protobuf:"bytes,2,rep,name=label_values,json=labelValues,proto3" json:"label_values,omitempty"`
+	// The data points of this timeseries. Point.value type MUST match the
+	// MetricDescriptor.type.
+	Points               []*Point `protobuf:"bytes,3,rep,name=points,proto3" json:"points,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *TimeSeries) Reset()         { *m = TimeSeries{} }
+func (m *TimeSeries) String() string { return proto.CompactTextString(m) }
+func (*TimeSeries) ProtoMessage()    {}
+func (*TimeSeries) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{3}
+}
+
+func (m *TimeSeries) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_TimeSeries.Unmarshal(m, b)
+}
+func (m *TimeSeries) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_TimeSeries.Marshal(b, m, deterministic)
+}
+func (m *TimeSeries) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TimeSeries.Merge(m, src)
+}
+func (m *TimeSeries) XXX_Size() int {
+	return xxx_messageInfo_TimeSeries.Size(m)
+}
+func (m *TimeSeries) XXX_DiscardUnknown() {
+	xxx_messageInfo_TimeSeries.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TimeSeries proto.InternalMessageInfo
+
+func (m *TimeSeries) GetStartTimestamp() *timestamp.Timestamp {
+	if m != nil {
+		return m.StartTimestamp
+	}
+	return nil
+}
+
+func (m *TimeSeries) GetLabelValues() []*LabelValue {
+	if m != nil {
+		return m.LabelValues
+	}
+	return nil
+}
+
+func (m *TimeSeries) GetPoints() []*Point {
+	if m != nil {
+		return m.Points
+	}
+	return nil
+}
+
+type LabelValue struct {
+	// The value for the label.
+	Value string `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
+	// If false the value field is ignored and considered not set.
+	// This is used to differentiate a missing label from an empty string.
+	HasValue             bool     `protobuf:"varint,2,opt,name=has_value,json=hasValue,proto3" json:"has_value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *LabelValue) Reset()         { *m = LabelValue{} }
+func (m *LabelValue) String() string { return proto.CompactTextString(m) }
+func (*LabelValue) ProtoMessage()    {}
+func (*LabelValue) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{4}
+}
+
+func (m *LabelValue) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_LabelValue.Unmarshal(m, b)
+}
+func (m *LabelValue) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_LabelValue.Marshal(b, m, deterministic)
+}
+func (m *LabelValue) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_LabelValue.Merge(m, src)
+}
+func (m *LabelValue) XXX_Size() int {
+	return xxx_messageInfo_LabelValue.Size(m)
+}
+func (m *LabelValue) XXX_DiscardUnknown() {
+	xxx_messageInfo_LabelValue.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_LabelValue proto.InternalMessageInfo
+
+func (m *LabelValue) GetValue() string {
+	if m != nil {
+		return m.Value
+	}
+	return ""
+}
+
+func (m *LabelValue) GetHasValue() bool {
+	if m != nil {
+		return m.HasValue
+	}
+	return false
+}
+
+// A timestamped measurement.
+type Point struct {
+	// The moment when this point was recorded. Inclusive.
+	// If not specified, the timestamp will be decided by the backend.
+	Timestamp *timestamp.Timestamp `protobuf:"bytes,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	// The actual point value.
+	//
+	// Types that are valid to be assigned to Value:
+	//	*Point_Int64Value
+	//	*Point_DoubleValue
+	//	*Point_DistributionValue
+	//	*Point_SummaryValue
+	Value                isPoint_Value `protobuf_oneof:"value"`
+	XXX_NoUnkeyedLiteral struct{}      `json:"-"`
+	XXX_unrecognized     []byte        `json:"-"`
+	XXX_sizecache        int32         `json:"-"`
+}
+
+func (m *Point) Reset()         { *m = Point{} }
+func (m *Point) String() string { return proto.CompactTextString(m) }
+func (*Point) ProtoMessage()    {}
+func (*Point) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{5}
+}
+
+func (m *Point) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Point.Unmarshal(m, b)
+}
+func (m *Point) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Point.Marshal(b, m, deterministic)
+}
+func (m *Point) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Point.Merge(m, src)
+}
+func (m *Point) XXX_Size() int {
+	return xxx_messageInfo_Point.Size(m)
+}
+func (m *Point) XXX_DiscardUnknown() {
+	xxx_messageInfo_Point.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Point proto.InternalMessageInfo
+
+func (m *Point) GetTimestamp() *timestamp.Timestamp {
+	if m != nil {
+		return m.Timestamp
+	}
+	return nil
+}
+
+type isPoint_Value interface {
+	isPoint_Value()
+}
+
+type Point_Int64Value struct {
+	Int64Value int64 `protobuf:"varint,2,opt,name=int64_value,json=int64Value,proto3,oneof"`
+}
+
+type Point_DoubleValue struct {
+	DoubleValue float64 `protobuf:"fixed64,3,opt,name=double_value,json=doubleValue,proto3,oneof"`
+}
+
+type Point_DistributionValue struct {
+	DistributionValue *DistributionValue `protobuf:"bytes,4,opt,name=distribution_value,json=distributionValue,proto3,oneof"`
+}
+
+type Point_SummaryValue struct {
+	SummaryValue *SummaryValue `protobuf:"bytes,5,opt,name=summary_value,json=summaryValue,proto3,oneof"`
+}
+
+func (*Point_Int64Value) isPoint_Value() {}
+
+func (*Point_DoubleValue) isPoint_Value() {}
+
+func (*Point_DistributionValue) isPoint_Value() {}
+
+func (*Point_SummaryValue) isPoint_Value() {}
+
+func (m *Point) GetValue() isPoint_Value {
+	if m != nil {
+		return m.Value
+	}
+	return nil
+}
+
+func (m *Point) GetInt64Value() int64 {
+	if x, ok := m.GetValue().(*Point_Int64Value); ok {
+		return x.Int64Value
+	}
+	return 0
+}
+
+func (m *Point) GetDoubleValue() float64 {
+	if x, ok := m.GetValue().(*Point_DoubleValue); ok {
+		return x.DoubleValue
+	}
+	return 0
+}
+
+func (m *Point) GetDistributionValue() *DistributionValue {
+	if x, ok := m.GetValue().(*Point_DistributionValue); ok {
+		return x.DistributionValue
+	}
+	return nil
+}
+
+func (m *Point) GetSummaryValue() *SummaryValue {
+	if x, ok := m.GetValue().(*Point_SummaryValue); ok {
+		return x.SummaryValue
+	}
+	return nil
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*Point) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*Point_Int64Value)(nil),
+		(*Point_DoubleValue)(nil),
+		(*Point_DistributionValue)(nil),
+		(*Point_SummaryValue)(nil),
+	}
+}
+
+// Distribution contains summary statistics for a population of values. It
+// optionally contains a histogram representing the distribution of those
+// values across a set of buckets.
+type DistributionValue struct {
+	// The number of values in the population. Must be non-negative. This value
+	// must equal the sum of the values in bucket_counts if a histogram is
+	// provided.
+	Count int64 `protobuf:"varint,1,opt,name=count,proto3" json:"count,omitempty"`
+	// The sum of the values in the population. If count is zero then this field
+	// must be zero.
+	Sum float64 `protobuf:"fixed64,2,opt,name=sum,proto3" json:"sum,omitempty"`
+	// The sum of squared deviations from the mean of the values in the
+	// population. For values x_i this is:
+	//
+	//     Sum[i=1..n]((x_i - mean)^2)
+	//
+	// Knuth, "The Art of Computer Programming", Vol. 2, page 323, 3rd edition
+	// describes Welford's method for accumulating this sum in one pass.
+	//
+	// If count is zero then this field must be zero.
+	SumOfSquaredDeviation float64 `protobuf:"fixed64,3,opt,name=sum_of_squared_deviation,json=sumOfSquaredDeviation,proto3" json:"sum_of_squared_deviation,omitempty"`
+	// Don't change bucket boundaries within a TimeSeries if your backend doesn't
+	// support this.
+	// TODO(issue #152): consider not required to send bucket options for
+	// optimization.
+	BucketOptions *DistributionValue_BucketOptions `protobuf:"bytes,4,opt,name=bucket_options,json=bucketOptions,proto3" json:"bucket_options,omitempty"`
+	// If the distribution does not have a histogram, then omit this field.
+	// If there is a histogram, then the sum of the values in the Bucket counts
+	// must equal the value in the count field of the distribution.
+	Buckets              []*DistributionValue_Bucket `protobuf:"bytes,5,rep,name=buckets,proto3" json:"buckets,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                    `json:"-"`
+	XXX_unrecognized     []byte                      `json:"-"`
+	XXX_sizecache        int32                       `json:"-"`
+}
+
+func (m *DistributionValue) Reset()         { *m = DistributionValue{} }
+func (m *DistributionValue) String() string { return proto.CompactTextString(m) }
+func (*DistributionValue) ProtoMessage()    {}
+func (*DistributionValue) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{6}
+}
+
+func (m *DistributionValue) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_DistributionValue.Unmarshal(m, b)
+}
+func (m *DistributionValue) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_DistributionValue.Marshal(b, m, deterministic)
+}
+func (m *DistributionValue) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DistributionValue.Merge(m, src)
+}
+func (m *DistributionValue) XXX_Size() int {
+	return xxx_messageInfo_DistributionValue.Size(m)
+}
+func (m *DistributionValue) XXX_DiscardUnknown() {
+	xxx_messageInfo_DistributionValue.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DistributionValue proto.InternalMessageInfo
+
+func (m *DistributionValue) GetCount() int64 {
+	if m != nil {
+		return m.Count
+	}
+	return 0
+}
+
+func (m *DistributionValue) GetSum() float64 {
+	if m != nil {
+		return m.Sum
+	}
+	return 0
+}
+
+func (m *DistributionValue) GetSumOfSquaredDeviation() float64 {
+	if m != nil {
+		return m.SumOfSquaredDeviation
+	}
+	return 0
+}
+
+func (m *DistributionValue) GetBucketOptions() *DistributionValue_BucketOptions {
+	if m != nil {
+		return m.BucketOptions
+	}
+	return nil
+}
+
+func (m *DistributionValue) GetBuckets() []*DistributionValue_Bucket {
+	if m != nil {
+		return m.Buckets
+	}
+	return nil
+}
+
+// A Distribution may optionally contain a histogram of the values in the
+// population. The bucket boundaries for that histogram are described by
+// BucketOptions.
+//
+// If bucket_options has no type, then there is no histogram associated with
+// the Distribution.
+type DistributionValue_BucketOptions struct {
+	// Types that are valid to be assigned to Type:
+	//	*DistributionValue_BucketOptions_Explicit_
+	Type                 isDistributionValue_BucketOptions_Type `protobuf_oneof:"type"`
+	XXX_NoUnkeyedLiteral struct{}                               `json:"-"`
+	XXX_unrecognized     []byte                                 `json:"-"`
+	XXX_sizecache        int32                                  `json:"-"`
+}
+
+func (m *DistributionValue_BucketOptions) Reset()         { *m = DistributionValue_BucketOptions{} }
+func (m *DistributionValue_BucketOptions) String() string { return proto.CompactTextString(m) }
+func (*DistributionValue_BucketOptions) ProtoMessage()    {}
+func (*DistributionValue_BucketOptions) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{6, 0}
+}
+
+func (m *DistributionValue_BucketOptions) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_DistributionValue_BucketOptions.Unmarshal(m, b)
+}
+func (m *DistributionValue_BucketOptions) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_DistributionValue_BucketOptions.Marshal(b, m, deterministic)
+}
+func (m *DistributionValue_BucketOptions) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DistributionValue_BucketOptions.Merge(m, src)
+}
+func (m *DistributionValue_BucketOptions) XXX_Size() int {
+	return xxx_messageInfo_DistributionValue_BucketOptions.Size(m)
+}
+func (m *DistributionValue_BucketOptions) XXX_DiscardUnknown() {
+	xxx_messageInfo_DistributionValue_BucketOptions.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DistributionValue_BucketOptions proto.InternalMessageInfo
+
+type isDistributionValue_BucketOptions_Type interface {
+	isDistributionValue_BucketOptions_Type()
+}
+
+type DistributionValue_BucketOptions_Explicit_ struct {
+	Explicit *DistributionValue_BucketOptions_Explicit `protobuf:"bytes,1,opt,name=explicit,proto3,oneof"`
+}
+
+func (*DistributionValue_BucketOptions_Explicit_) isDistributionValue_BucketOptions_Type() {}
+
+func (m *DistributionValue_BucketOptions) GetType() isDistributionValue_BucketOptions_Type {
+	if m != nil {
+		return m.Type
+	}
+	return nil
+}
+
+func (m *DistributionValue_BucketOptions) GetExplicit() *DistributionValue_BucketOptions_Explicit {
+	if x, ok := m.GetType().(*DistributionValue_BucketOptions_Explicit_); ok {
+		return x.Explicit
+	}
+	return nil
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*DistributionValue_BucketOptions) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*DistributionValue_BucketOptions_Explicit_)(nil),
+	}
+}
+
+// Specifies a set of buckets with arbitrary upper-bounds.
+// This defines size(bounds) + 1 (= N) buckets. The boundaries for bucket
+// index i are:
+//
+// [0, bucket_bounds[i]) for i == 0
+// [bucket_bounds[i-1], bucket_bounds[i]) for 0 < i < N-1
+// [bucket_bounds[i], +infinity) for i == N-1
+type DistributionValue_BucketOptions_Explicit struct {
+	// The values must be strictly increasing and > 0.
+	Bounds               []float64 `protobuf:"fixed64,1,rep,packed,name=bounds,proto3" json:"bounds,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
+	XXX_unrecognized     []byte    `json:"-"`
+	XXX_sizecache        int32     `json:"-"`
+}
+
+func (m *DistributionValue_BucketOptions_Explicit) Reset() {
+	*m = DistributionValue_BucketOptions_Explicit{}
+}
+func (m *DistributionValue_BucketOptions_Explicit) String() string { return proto.CompactTextString(m) }
+func (*DistributionValue_BucketOptions_Explicit) ProtoMessage()    {}
+func (*DistributionValue_BucketOptions_Explicit) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{6, 0, 0}
+}
+
+func (m *DistributionValue_BucketOptions_Explicit) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_DistributionValue_BucketOptions_Explicit.Unmarshal(m, b)
+}
+func (m *DistributionValue_BucketOptions_Explicit) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_DistributionValue_BucketOptions_Explicit.Marshal(b, m, deterministic)
+}
+func (m *DistributionValue_BucketOptions_Explicit) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DistributionValue_BucketOptions_Explicit.Merge(m, src)
+}
+func (m *DistributionValue_BucketOptions_Explicit) XXX_Size() int {
+	return xxx_messageInfo_DistributionValue_BucketOptions_Explicit.Size(m)
+}
+func (m *DistributionValue_BucketOptions_Explicit) XXX_DiscardUnknown() {
+	xxx_messageInfo_DistributionValue_BucketOptions_Explicit.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DistributionValue_BucketOptions_Explicit proto.InternalMessageInfo
+
+func (m *DistributionValue_BucketOptions_Explicit) GetBounds() []float64 {
+	if m != nil {
+		return m.Bounds
+	}
+	return nil
+}
+
+type DistributionValue_Bucket struct {
+	// The number of values in each bucket of the histogram, as described in
+	// bucket_bounds.
+	Count int64 `protobuf:"varint,1,opt,name=count,proto3" json:"count,omitempty"`
+	// If the distribution does not have a histogram, then omit this field.
+	Exemplar             *DistributionValue_Exemplar `protobuf:"bytes,2,opt,name=exemplar,proto3" json:"exemplar,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                    `json:"-"`
+	XXX_unrecognized     []byte                      `json:"-"`
+	XXX_sizecache        int32                       `json:"-"`
+}
+
+func (m *DistributionValue_Bucket) Reset()         { *m = DistributionValue_Bucket{} }
+func (m *DistributionValue_Bucket) String() string { return proto.CompactTextString(m) }
+func (*DistributionValue_Bucket) ProtoMessage()    {}
+func (*DistributionValue_Bucket) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{6, 1}
+}
+
+func (m *DistributionValue_Bucket) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_DistributionValue_Bucket.Unmarshal(m, b)
+}
+func (m *DistributionValue_Bucket) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_DistributionValue_Bucket.Marshal(b, m, deterministic)
+}
+func (m *DistributionValue_Bucket) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DistributionValue_Bucket.Merge(m, src)
+}
+func (m *DistributionValue_Bucket) XXX_Size() int {
+	return xxx_messageInfo_DistributionValue_Bucket.Size(m)
+}
+func (m *DistributionValue_Bucket) XXX_DiscardUnknown() {
+	xxx_messageInfo_DistributionValue_Bucket.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DistributionValue_Bucket proto.InternalMessageInfo
+
+func (m *DistributionValue_Bucket) GetCount() int64 {
+	if m != nil {
+		return m.Count
+	}
+	return 0
+}
+
+func (m *DistributionValue_Bucket) GetExemplar() *DistributionValue_Exemplar {
+	if m != nil {
+		return m.Exemplar
+	}
+	return nil
+}
+
+// Exemplars are example points that may be used to annotate aggregated
+// Distribution values. They are metadata that gives information about a
+// particular value added to a Distribution bucket.
+type DistributionValue_Exemplar struct {
+	// Value of the exemplar point. It determines which bucket the exemplar
+	// belongs to.
+	Value float64 `protobuf:"fixed64,1,opt,name=value,proto3" json:"value,omitempty"`
+	// The observation (sampling) time of the above value.
+	Timestamp *timestamp.Timestamp `protobuf:"bytes,2,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	// Contextual information about the example value.
+	Attachments          map[string]string `protobuf:"bytes,3,rep,name=attachments,proto3" json:"attachments,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *DistributionValue_Exemplar) Reset()         { *m = DistributionValue_Exemplar{} }
+func (m *DistributionValue_Exemplar) String() string { return proto.CompactTextString(m) }
+func (*DistributionValue_Exemplar) ProtoMessage()    {}
+func (*DistributionValue_Exemplar) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{6, 2}
+}
+
+func (m *DistributionValue_Exemplar) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_DistributionValue_Exemplar.Unmarshal(m, b)
+}
+func (m *DistributionValue_Exemplar) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_DistributionValue_Exemplar.Marshal(b, m, deterministic)
+}
+func (m *DistributionValue_Exemplar) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_DistributionValue_Exemplar.Merge(m, src)
+}
+func (m *DistributionValue_Exemplar) XXX_Size() int {
+	return xxx_messageInfo_DistributionValue_Exemplar.Size(m)
+}
+func (m *DistributionValue_Exemplar) XXX_DiscardUnknown() {
+	xxx_messageInfo_DistributionValue_Exemplar.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_DistributionValue_Exemplar proto.InternalMessageInfo
+
+func (m *DistributionValue_Exemplar) GetValue() float64 {
+	if m != nil {
+		return m.Value
+	}
+	return 0
+}
+
+func (m *DistributionValue_Exemplar) GetTimestamp() *timestamp.Timestamp {
+	if m != nil {
+		return m.Timestamp
+	}
+	return nil
+}
+
+func (m *DistributionValue_Exemplar) GetAttachments() map[string]string {
+	if m != nil {
+		return m.Attachments
+	}
+	return nil
+}
+
+// The start_timestamp only applies to the count and sum in the SummaryValue.
+type SummaryValue struct {
+	// The total number of recorded values since start_time. Optional since
+	// some systems don't expose this.
+	Count *wrappers.Int64Value `protobuf:"bytes,1,opt,name=count,proto3" json:"count,omitempty"`
+	// The total sum of recorded values since start_time. Optional since some
+	// systems don't expose this. If count is zero then this field must be zero.
+	// This field must be unset if the sum is not available.
+	Sum *wrappers.DoubleValue `protobuf:"bytes,2,opt,name=sum,proto3" json:"sum,omitempty"`
+	// Values calculated over an arbitrary time window.
+	Snapshot             *SummaryValue_Snapshot `protobuf:"bytes,3,opt,name=snapshot,proto3" json:"snapshot,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}               `json:"-"`
+	XXX_unrecognized     []byte                 `json:"-"`
+	XXX_sizecache        int32                  `json:"-"`
+}
+
+func (m *SummaryValue) Reset()         { *m = SummaryValue{} }
+func (m *SummaryValue) String() string { return proto.CompactTextString(m) }
+func (*SummaryValue) ProtoMessage()    {}
+func (*SummaryValue) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{7}
+}
+
+func (m *SummaryValue) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SummaryValue.Unmarshal(m, b)
+}
+func (m *SummaryValue) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SummaryValue.Marshal(b, m, deterministic)
+}
+func (m *SummaryValue) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SummaryValue.Merge(m, src)
+}
+func (m *SummaryValue) XXX_Size() int {
+	return xxx_messageInfo_SummaryValue.Size(m)
+}
+func (m *SummaryValue) XXX_DiscardUnknown() {
+	xxx_messageInfo_SummaryValue.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SummaryValue proto.InternalMessageInfo
+
+func (m *SummaryValue) GetCount() *wrappers.Int64Value {
+	if m != nil {
+		return m.Count
+	}
+	return nil
+}
+
+func (m *SummaryValue) GetSum() *wrappers.DoubleValue {
+	if m != nil {
+		return m.Sum
+	}
+	return nil
+}
+
+func (m *SummaryValue) GetSnapshot() *SummaryValue_Snapshot {
+	if m != nil {
+		return m.Snapshot
+	}
+	return nil
+}
+
+// The values in this message can be reset at arbitrary unknown times, with
+// the requirement that all of them are reset at the same time.
+type SummaryValue_Snapshot struct {
+	// The number of values in the snapshot. Optional since some systems don't
+	// expose this.
+	Count *wrappers.Int64Value `protobuf:"bytes,1,opt,name=count,proto3" json:"count,omitempty"`
+	// The sum of values in the snapshot. Optional since some systems don't
+	// expose this. If count is zero then this field must be zero or not set
+	// (if not supported).
+	Sum *wrappers.DoubleValue `protobuf:"bytes,2,opt,name=sum,proto3" json:"sum,omitempty"`
+	// A list of values at different percentiles of the distribution calculated
+	// from the current snapshot. The percentiles must be strictly increasing.
+	PercentileValues     []*SummaryValue_Snapshot_ValueAtPercentile `protobuf:"bytes,3,rep,name=percentile_values,json=percentileValues,proto3" json:"percentile_values,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                                   `json:"-"`
+	XXX_unrecognized     []byte                                     `json:"-"`
+	XXX_sizecache        int32                                      `json:"-"`
+}
+
+func (m *SummaryValue_Snapshot) Reset()         { *m = SummaryValue_Snapshot{} }
+func (m *SummaryValue_Snapshot) String() string { return proto.CompactTextString(m) }
+func (*SummaryValue_Snapshot) ProtoMessage()    {}
+func (*SummaryValue_Snapshot) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{7, 0}
+}
+
+func (m *SummaryValue_Snapshot) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SummaryValue_Snapshot.Unmarshal(m, b)
+}
+func (m *SummaryValue_Snapshot) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SummaryValue_Snapshot.Marshal(b, m, deterministic)
+}
+func (m *SummaryValue_Snapshot) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SummaryValue_Snapshot.Merge(m, src)
+}
+func (m *SummaryValue_Snapshot) XXX_Size() int {
+	return xxx_messageInfo_SummaryValue_Snapshot.Size(m)
+}
+func (m *SummaryValue_Snapshot) XXX_DiscardUnknown() {
+	xxx_messageInfo_SummaryValue_Snapshot.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SummaryValue_Snapshot proto.InternalMessageInfo
+
+func (m *SummaryValue_Snapshot) GetCount() *wrappers.Int64Value {
+	if m != nil {
+		return m.Count
+	}
+	return nil
+}
+
+func (m *SummaryValue_Snapshot) GetSum() *wrappers.DoubleValue {
+	if m != nil {
+		return m.Sum
+	}
+	return nil
+}
+
+func (m *SummaryValue_Snapshot) GetPercentileValues() []*SummaryValue_Snapshot_ValueAtPercentile {
+	if m != nil {
+		return m.PercentileValues
+	}
+	return nil
+}
+
+// Represents the value at a given percentile of a distribution.
+type SummaryValue_Snapshot_ValueAtPercentile struct {
+	// The percentile of a distribution. Must be in the interval
+	// (0.0, 100.0].
+	Percentile float64 `protobuf:"fixed64,1,opt,name=percentile,proto3" json:"percentile,omitempty"`
+	// The value at the given percentile of a distribution.
+	Value                float64  `protobuf:"fixed64,2,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *SummaryValue_Snapshot_ValueAtPercentile) Reset() {
+	*m = SummaryValue_Snapshot_ValueAtPercentile{}
+}
+func (m *SummaryValue_Snapshot_ValueAtPercentile) String() string { return proto.CompactTextString(m) }
+func (*SummaryValue_Snapshot_ValueAtPercentile) ProtoMessage()    {}
+func (*SummaryValue_Snapshot_ValueAtPercentile) Descriptor() ([]byte, []int) {
+	return fileDescriptor_0ee3deb72053811a, []int{7, 0, 0}
+}
+
+func (m *SummaryValue_Snapshot_ValueAtPercentile) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_SummaryValue_Snapshot_ValueAtPercentile.Unmarshal(m, b)
+}
+func (m *SummaryValue_Snapshot_ValueAtPercentile) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_SummaryValue_Snapshot_ValueAtPercentile.Marshal(b, m, deterministic)
+}
+func (m *SummaryValue_Snapshot_ValueAtPercentile) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_SummaryValue_Snapshot_ValueAtPercentile.Merge(m, src)
+}
+func (m *SummaryValue_Snapshot_ValueAtPercentile) XXX_Size() int {
+	return xxx_messageInfo_SummaryValue_Snapshot_ValueAtPercentile.Size(m)
+}
+func (m *SummaryValue_Snapshot_ValueAtPercentile) XXX_DiscardUnknown() {
+	xxx_messageInfo_SummaryValue_Snapshot_ValueAtPercentile.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_SummaryValue_Snapshot_ValueAtPercentile proto.InternalMessageInfo
+
+func (m *SummaryValue_Snapshot_ValueAtPercentile) GetPercentile() float64 {
+	if m != nil {
+		return m.Percentile
+	}
+	return 0
+}
+
+func (m *SummaryValue_Snapshot_ValueAtPercentile) GetValue() float64 {
+	if m != nil {
+		return m.Value
+	}
+	return 0
+}
+
+func init() {
+	proto.RegisterEnum("opencensus.proto.metrics.v1.MetricDescriptor_Type", MetricDescriptor_Type_name, MetricDescriptor_Type_value)
+	proto.RegisterType((*Metric)(nil), "opencensus.proto.metrics.v1.Metric")
+	proto.RegisterType((*MetricDescriptor)(nil), "opencensus.proto.metrics.v1.MetricDescriptor")
+	proto.RegisterType((*LabelKey)(nil), "opencensus.proto.metrics.v1.LabelKey")
+	proto.RegisterType((*TimeSeries)(nil), "opencensus.proto.metrics.v1.TimeSeries")
+	proto.RegisterType((*LabelValue)(nil), "opencensus.proto.metrics.v1.LabelValue")
+	proto.RegisterType((*Point)(nil), "opencensus.proto.metrics.v1.Point")
+	proto.RegisterType((*DistributionValue)(nil), "opencensus.proto.metrics.v1.DistributionValue")
+	proto.RegisterType((*DistributionValue_BucketOptions)(nil), "opencensus.proto.metrics.v1.DistributionValue.BucketOptions")
+	proto.RegisterType((*DistributionValue_BucketOptions_Explicit)(nil), "opencensus.proto.metrics.v1.DistributionValue.BucketOptions.Explicit")
+	proto.RegisterType((*DistributionValue_Bucket)(nil), "opencensus.proto.metrics.v1.DistributionValue.Bucket")
+	proto.RegisterType((*DistributionValue_Exemplar)(nil), "opencensus.proto.metrics.v1.DistributionValue.Exemplar")
+	proto.RegisterMapType((map[string]string)(nil), "opencensus.proto.metrics.v1.DistributionValue.Exemplar.AttachmentsEntry")
+	proto.RegisterType((*SummaryValue)(nil), "opencensus.proto.metrics.v1.SummaryValue")
+	proto.RegisterType((*SummaryValue_Snapshot)(nil), "opencensus.proto.metrics.v1.SummaryValue.Snapshot")
+	proto.RegisterType((*SummaryValue_Snapshot_ValueAtPercentile)(nil), "opencensus.proto.metrics.v1.SummaryValue.Snapshot.ValueAtPercentile")
+}
+
+func init() {
+	proto.RegisterFile("opencensus/proto/metrics/v1/metrics.proto", fileDescriptor_0ee3deb72053811a)
+}
+
+var fileDescriptor_0ee3deb72053811a = []byte{
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+}